The "ui" command:

Usage: fossil server ?OPTIONS? ?REPOSITORY?
or: fossil ui ?OPTIONS? ?REPOSITORY?
Open a socket and begin listening and responding to HTTP requests on
TCP port 8080, or on any other TCP port defined by the -P or
--port option. The optional argument is the name of the repository.
The repository argument may be omitted if the working directory is
within an open checkout.
The "ui" command automatically starts a web browser after initializing
the web server. The "ui" command also binds to 127.0.0.1 and so will
only process HTTP traffic from the local machine.
The REPOSITORY can be a directory (aka folder) that contains one or
more repositories with names ending in ".fossil". In this case, a
prefix of the URL pathname is used to search the directory for an
appropriate repository. To thwart mischief, the pathname in the URL must
contain only alphanumerics, "_", "/", "-", and ".", and no "-" may
occur after "/", and every "." must be surrounded on both sides by
alphanumerics. Any pathname that does not satisfy these constraints
results in a 404 error. Files in REPOSITORY that match the comma-separated
list of glob patterns given by --files and that have known suffixes
such as ".txt" or ".html" or ".jpeg" and do not match the pattern
"*.fossil*" will be served as static content. With the "ui" command,
the REPOSITORY can only be a directory if the --notfound option is
also present.
For the special case REPOSITORY name of "/", the list global configuration
database is consulted for a list of all known repositories. The --repolist
option is implied by this special case. See also the "fossil all ui"
command.
By default, the "ui" command provides full administrative access without
having to log in. This can be disabled by turning off the "localauth"
setting. Automatic login for the "server" command is available if the
--localauth option is present and the "localauth" setting is off and the
connection is from localhost. The "ui" command also enables --repolist
by default.
Options:
--baseurl URL Use URL as the base (useful for reverse proxies)
--create Create a new REPOSITORY if it does not already exist
--page PAGE Start "ui" on PAGE. ex: --page "timeline?y=ci"
--files GLOBLIST Comma-separated list of glob patterns for static files
--localauth enable automatic login for requests from localhost
--localhost listen on 127.0.0.1 only (always true for "ui")
--https signal a request coming in via https
--max-latency N Do not let any single HTTP request run for more than N
seconds (only works on unix)
--nocompress Do not compress HTTP replies
--nojail Drop root privileges but do not enter the chroot jail
--nossl signal that no SSL connections are available
--notfound URL Redirect
-P|--port TCPPORT listen to request on port TCPPORT
--th-trace trace TH1 execution (for debugging purposes)
--repolist If REPOSITORY is dir, URL "/" lists repos.
--scgi Accept SCGI rather than HTTP
--skin LABEL Use override skin LABEL
--usepidkey Use saved encryption key from parent process. This is
only necessary when using SEE on Windows.
See also: cgi, http, winsrv